/src/boringssl/include/openssl/pem.h

Source
// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef OPENSSL_HEADER_PEM_H
#define OPENSSL_HEADER_PEM_H

#include <openssl/base64.h>
#include <openssl/bio.h>
#include <openssl/cipher.h>
#include <openssl/digest.h>
#include <openssl/evp.h>
#include <openssl/pkcs7.h>
#include <openssl/stack.h>
#include <openssl/x509.h>

// For compatibility with open-iscsi, which assumes that it can get
// `OPENSSL_malloc` from pem.h or err.h
#include <openssl/crypto.h>

#if defined(__cplusplus)
extern "C" {
#endif


// PEM.
//
// This library contains functions for reading and writing data encoded in PEM
// format. This format originated in Privacy-Enhanced Mail (RFC 1421).
//
// As an exception to RFC 1421, generally PEM data is limited to 1 GiB by this
// library. This limit should not affect anyone in practice.
//
// TODO(crbug.com/42290574): Finish documenting this header.


#define PEM_BUFSIZE 1024

#define PEM_STRING_X509_OLD "X509 CERTIFICATE"
#define PEM_STRING_X509 "CERTIFICATE"
#define PEM_STRING_X509_PAIR "CERTIFICATE PAIR"
#define PEM_STRING_X509_TRUSTED "TRUSTED CERTIFICATE"
#define PEM_STRING_X509_REQ_OLD "NEW CERTIFICATE REQUEST"
#define PEM_STRING_X509_REQ "CERTIFICATE REQUEST"
#define PEM_STRING_X509_CRL "X509 CRL"
#define PEM_STRING_EVP_PKEY "ANY PRIVATE KEY"
#define PEM_STRING_PUBLIC "PUBLIC KEY"
#define PEM_STRING_RSA "RSA PRIVATE KEY"
#define PEM_STRING_RSA_PUBLIC "RSA PUBLIC KEY"
#define PEM_STRING_DSA "DSA PRIVATE KEY"
#define PEM_STRING_DSA_PUBLIC "DSA PUBLIC KEY"
#define PEM_STRING_EC "EC PRIVATE KEY"
#define PEM_STRING_PKCS7 "PKCS7"
#define PEM_STRING_PKCS7_SIGNED "PKCS #7 SIGNED DATA"
#define PEM_STRING_PKCS8 "ENCRYPTED PRIVATE KEY"
#define PEM_STRING_PKCS8INF "PRIVATE KEY"
#define PEM_STRING_DHPARAMS "DH PARAMETERS"
#define PEM_STRING_SSL_SESSION "SSL SESSION PARAMETERS"
#define PEM_STRING_DSAPARAMS "DSA PARAMETERS"
#define PEM_STRING_ECDSA_PUBLIC "ECDSA PUBLIC KEY"
#define PEM_STRING_ECPRIVATEKEY "EC PRIVATE KEY"
#define PEM_STRING_CMS "CMS"

#define PEM_TYPE_ENCRYPTED 10
#define PEM_TYPE_MIC_ONLY 20
#define PEM_TYPE_MIC_CLEAR 30
#define PEM_TYPE_CLEAR 40

// These macros make the PEM_read/PEM_write functions easier to maintain and
// write. Now they are all implemented with either:
// IMPLEMENT_PEM_rw(...) or IMPLEMENT_PEM_rw_cb(...)


#define IMPLEMENT_PEM_read_fp(name, type, str, asn1)                         \
  static void *pem_read_##name##_d2i(void **x, const unsigned char **inp,    \
                                     long len) {                             \
    return d2i_##asn1((type **)x, inp, len);                                 \
  }                                                                          \
  OPENSSL_EXPORT type *PEM_read_##name(FILE *fp, type **x,                   \
                                       pem_password_cb *cb, void *u) {       \
    return (type *)PEM_ASN1_read(pem_read_##name##_d2i, str, fp, (void **)x, \
                                 cb, u);                                     \
  }

#define IMPLEMENT_PEM_write_fp(name, type, str, asn1)                        \
  static int pem_write_##name##_i2d(const void *x, unsigned char **outp) {   \
    return i2d_##asn1((type *)x, outp);                                      \
  }                                                                          \
  OPENSSL_EXPORT int PEM_write_##name(FILE *fp, type *x) {                   \
    return PEM_ASN1_write(pem_write_##name##_i2d, str, fp, x, NULL, NULL, 0, \
                          NULL, NULL);                                       \
  }

#define IMPLEMENT_PEM_write_fp_const(name, type, str, asn1)                 \
  static int pem_write_##name##_i2d(const void *x, unsigned char **outp) {  \
    return i2d_##asn1((const type *)x, outp);                               \
  }                                                                         \
  OPENSSL_EXPORT int PEM_write_##name(FILE *fp, const type *x) {            \
    return PEM_ASN1_write(pem_write_##name##_i2d, str, fp, (void *)x, NULL, \
                          NULL, 0, NULL, NULL);                             \
  }

#define IMPLEMENT_PEM_write_cb_fp(name, type, str, asn1)                   \
  static int pem_write_##name##_i2d(const void *x, unsigned char **outp) { \
    return i2d_##asn1((type *)x, outp);                                    \
  }                                                                        \
  OPENSSL_EXPORT int PEM_write_##name(                                     \
      FILE *fp, type *x, const EVP_CIPHER *enc, const unsigned char *pass, \
      int pass_len, pem_password_cb *cb, void *u) {                        \
    return PEM_ASN1_write(pem_write_##name##_i2d, str, fp, x, enc, pass,   \
                          pass_len, cb, u);                                \
  }

#define IMPLEMENT_PEM_write_cb_fp_const(name, type, str, asn1)             \
  static int pem_write_##name##_i2d(const void *x, unsigned char **outp) { \
    return i2d_##asn1((const type *)x, outp);                              \
  }                                                                        \
  OPENSSL_EXPORT int PEM_write_##name(                                     \
      FILE *fp, type *x, const EVP_CIPHER *enc, const unsigned char *pass, \
      int pass_len, pem_password_cb *cb, void *u) {                        \
    return PEM_ASN1_write(pem_write_##name##_i2d, str, fp, x, enc, pass,   \
                          pass_len, cb, u);                                \
  }


#define IMPLEMENT_PEM_read_bio(name, type, str, asn1)                         \
  static void *pem_read_bio_##name##_d2i(void **x, const unsigned char **inp, \
                                         long len) {                          \
    return d2i_##asn1((type **)x, inp, len);                                  \
  }                                                                           \
  OPENSSL_EXPORT type *PEM_read_bio_##name(BIO *bp, type **x,                 \
                                           pem_password_cb *cb, void *u) {    \
    return (type *)PEM_ASN1_read_bio(pem_read_bio_##name##_d2i, str, bp,      \
                                     (void **)x, cb, u);                      \
  }

#define IMPLEMENT_PEM_write_bio(name, type, str, asn1)                         \
  static int pem_write_bio_##name##_i2d(const void *x, unsigned char **outp) { \
    return i2d_##asn1((type *)x, outp);                                        \
  }                                                                            \
  OPENSSL_EXPORT int PEM_write_bio_##name(BIO *bp, type *x) {                  \
    return PEM_ASN1_write_bio(pem_write_bio_##name##_i2d, str, bp, x, NULL,    \
                              NULL, 0, NULL, NULL);                            \
  }

#define IMPLEMENT_PEM_write_bio_const(name, type, str, asn1)                   \
  static int pem_write_bio_##name##_i2d(const void *x, unsigned char **outp) { \
    return i2d_##asn1((const type *)x, outp);                                  \
  }                                                                            \
  OPENSSL_EXPORT int PEM_write_bio_##name(BIO *bp, const type *x) {            \
    return PEM_ASN1_write_bio(pem_write_bio_##name##_i2d, str, bp, (void *)x,  \
                              NULL, NULL, 0, NULL, NULL);                      \
  }

#define IMPLEMENT_PEM_write_cb_bio(name, type, str, asn1)                      \
  static int pem_write_bio_##name##_i2d(const void *x, unsigned char **outp) { \
    return i2d_##asn1((type *)x, outp);                                        \
  }                                                                            \
  OPENSSL_EXPORT int PEM_write_bio_##name(                                     \
      BIO *bp, type *x, const EVP_CIPHER *enc, const unsigned char *pass,      \
      int pass_len, pem_password_cb *cb, void *u) {                            \
    return PEM_ASN1_write_bio(pem_write_bio_##name##_i2d, str, bp, x, enc,     \
                              pass, pass_len, cb, u);                          \
  }

#define IMPLEMENT_PEM_write_cb_bio_const(name, type, str, asn1)                \
  static int pem_write_bio_##name##_i2d(const void *x, unsigned char **outp) { \
    return i2d_##asn1((const type *)x, outp);                                  \
  }                                                                            \
  OPENSSL_EXPORT int PEM_write_bio_##name(                                     \
      BIO *bp, type *x, const EVP_CIPHER *enc, const unsigned char *pass,      \
      int pass_len, pem_password_cb *cb, void *u) {                            \
    return PEM_ASN1_write_bio(pem_write_bio_##name##_i2d, str, bp, (void *)x,  \
                              enc, pass, pass_len, cb, u);                     \
  }

#define IMPLEMENT_PEM_write(name, type, str, asn1) \
  IMPLEMENT_PEM_write_bio(name, type, str, asn1)   \
  IMPLEMENT_PEM_write_fp(name, type, str, asn1)

#define IMPLEMENT_PEM_write_const(name, type, str, asn1) \
  IMPLEMENT_PEM_write_bio_const(name, type, str, asn1)   \
  IMPLEMENT_PEM_write_fp_const(name, type, str, asn1)

#define IMPLEMENT_PEM_write_cb(name, type, str, asn1) \
  IMPLEMENT_PEM_write_cb_bio(name, type, str, asn1)   \
  IMPLEMENT_PEM_write_cb_fp(name, type, str, asn1)

#define IMPLEMENT_PEM_write_cb_const(name, type, str, asn1) \
  IMPLEMENT_PEM_write_cb_bio_const(name, type, str, asn1)   \
  IMPLEMENT_PEM_write_cb_fp_const(name, type, str, asn1)

#define IMPLEMENT_PEM_read(name, type, str, asn1) \
  IMPLEMENT_PEM_read_bio(name, type, str, asn1)   \
  IMPLEMENT_PEM_read_fp(name, type, str, asn1)

#define IMPLEMENT_PEM_rw(name, type, str, asn1) \
  IMPLEMENT_PEM_read(name, type, str, asn1)     \
  IMPLEMENT_PEM_write(name, type, str, asn1)

#define IMPLEMENT_PEM_rw_const(name, type, str, asn1) \
  IMPLEMENT_PEM_read(name, type, str, asn1)           \
  IMPLEMENT_PEM_write_const(name, type, str, asn1)

#define IMPLEMENT_PEM_rw_cb(name, type, str, asn1) \
  IMPLEMENT_PEM_read(name, type, str, asn1)        \
  IMPLEMENT_PEM_write_cb(name, type, str, asn1)

// These are the same except they are for the declarations

#define DECLARE_PEM_read_fp(name, type)                    \
  OPENSSL_EXPORT type *PEM_read_##name(FILE *fp, type **x, \
                                       pem_password_cb *cb, void *u);

#define DECLARE_PEM_write_fp(name, type) \
  OPENSSL_EXPORT int PEM_write_##name(FILE *fp, type *x);

#define DECLARE_PEM_write_fp_const(name, type) \
  OPENSSL_EXPORT int PEM_write_##name(FILE *fp, const type *x);

#define DECLARE_PEM_write_cb_fp(name, type)                                \
  OPENSSL_EXPORT int PEM_write_##name(                                     \
      FILE *fp, type *x, const EVP_CIPHER *enc, const unsigned char *pass, \
      int pass_len, pem_password_cb *cb, void *u);

#define DECLARE_PEM_read_bio(name, type)                      \
  OPENSSL_EXPORT type *PEM_read_bio_##name(BIO *bp, type **x, \
                                           pem_password_cb *cb, void *u);

#define DECLARE_PEM_write_bio(name, type) \
  OPENSSL_EXPORT int PEM_write_bio_##name(BIO *bp, type *x);

#define DECLARE_PEM_write_bio_const(name, type) \
  OPENSSL_EXPORT int PEM_write_bio_##name(BIO *bp, const type *x);

#define DECLARE_PEM_write_cb_bio(name, type)                              \
  OPENSSL_EXPORT int PEM_write_bio_##name(                                \
      BIO *bp, type *x, const EVP_CIPHER *enc, const unsigned char *pass, \
      int pass_len, pem_password_cb *cb, void *u);


#define DECLARE_PEM_write(name, type) \
  DECLARE_PEM_write_bio(name, type)   \
  DECLARE_PEM_write_fp(name, type)

#define DECLARE_PEM_write_const(name, type) \
  DECLARE_PEM_write_bio_const(name, type)   \
  DECLARE_PEM_write_fp_const(name, type)

#define DECLARE_PEM_write_cb(name, type) \
  DECLARE_PEM_write_cb_bio(name, type)   \
  DECLARE_PEM_write_cb_fp(name, type)

#define DECLARE_PEM_read(name, type) \
  DECLARE_PEM_read_bio(name, type)   \
  DECLARE_PEM_read_fp(name, type)

#define DECLARE_PEM_rw(name, type) \
  DECLARE_PEM_read(name, type)     \
  DECLARE_PEM_write(name, type)

#define DECLARE_PEM_rw_const(name, type) \
  DECLARE_PEM_read(name, type)           \
  DECLARE_PEM_write_const(name, type)

#define DECLARE_PEM_rw_cb(name, type) \
  DECLARE_PEM_read(name, type)        \
  DECLARE_PEM_write_cb(name, type)

// "userdata": new with OpenSSL 0.9.4
typedef int pem_password_cb(char *buf, int size, int rwflag, void *userdata);

// PEM_read_bio reads from `bp`, until the next PEM block. If one is found, it
// returns one and sets `*name`, `*header`, and `*data` to newly-allocated
// buffers containing the PEM type, the header block, and the decoded data,
// respectively. `*name` and `*header` are NUL-terminated C strings, while
// `*data` has `*len` bytes. The caller must release each of `*name`, `*header`,
// and `*data` with `OPENSSL_free` when done. If no PEM block is found, this
// function returns zero and pushes `PEM_R_NO_START_LINE` to the error queue. If
// one is found, but there is an error decoding it, it returns zero and pushes
// some other error to the error queue.
OPENSSL_EXPORT int PEM_read_bio(BIO *bp, char **name, char **header,
                                unsigned char **data, long *len);

// PEM_write_bio writes a PEM block to `bp`, containing `len` bytes from `data`
// as data. `name` and `hdr` are NUL-terminated C strings containing the PEM
// type and header block, respectively. This function returns zero on error and
// the number of bytes written on success.
OPENSSL_EXPORT int PEM_write_bio(BIO *bp, const char *name, const char *hdr,
                                 const unsigned char *data, long len);

OPENSSL_EXPORT int PEM_bytes_read_bio(unsigned char **pdata, long *plen,
                                      char **pnm, const char *name, BIO *bp,
                                      pem_password_cb *cb, void *u);
OPENSSL_EXPORT void *PEM_ASN1_read_bio(d2i_of_void *d2i, const char *name,
                                       BIO *bp, void **x, pem_password_cb *cb,
                                       void *u);
OPENSSL_EXPORT int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name,
                                      BIO *bp, void *x, const EVP_CIPHER *enc,
                                      const unsigned char *pass, int pass_len,
                                      pem_password_cb *cb, void *u);

// PEM_X509_INFO_read_bio reads PEM blocks from `bp` and decodes any
// certificates, CRLs, and private keys found. It returns a
// `STACK_OF(X509_INFO)` structure containing the results, or NULL on error.
//
// If `sk` is NULL, the result on success will be a newly-allocated
// `STACK_OF(X509_INFO)` structure which should be released with
// `sk_X509_INFO_pop_free` and `X509_INFO_free` when done.
//
// If `sk` is non-NULL, it appends the results to `sk` instead and returns `sk`
// on success. In this case, the caller retains ownership of `sk` in both
// success and failure.
//
// This function will decrypt any encrypted certificates in `bp`, using `cb`,
// but it will not decrypt encrypted private keys. Encrypted private keys are
// instead represented as placeholder `X509_INFO` objects with an empty `x_pkey`
// field. This allows this function to be used with inputs with unencrypted
// certificates, but encrypted passwords, without knowing the password. However,
// it also means that this function cannot be used to decrypt the private key
// when the password is known.
//
// WARNING: If the input contains "TRUSTED CERTIFICATE" PEM blocks, this
// function parses auxiliary properties as in `d2i_X509_AUX`. Passing untrusted
// input to this function allows an attacker to influence those properties. See
// `d2i_X509_AUX` for details.
OPENSSL_EXPORT STACK_OF(X509_INFO) *PEM_X509_INFO_read_bio(
    BIO *bp, STACK_OF(X509_INFO) *sk, pem_password_cb *cb, void *u);

// PEM_X509_INFO_read behaves like `PEM_X509_INFO_read_bio` but reads from a
// `FILE`.
OPENSSL_EXPORT STACK_OF(X509_INFO) *PEM_X509_INFO_read(FILE *fp,
                                                       STACK_OF(X509_INFO) *sk,
                                                       pem_password_cb *cb,
                                                       void *u);

OPENSSL_EXPORT int PEM_read(FILE *fp, char **name, char **header,
                            unsigned char **data, long *len);
OPENSSL_EXPORT int PEM_write(FILE *fp, const char *name, const char *hdr,
                             const unsigned char *data, long len);
OPENSSL_EXPORT void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp,
                                   void **x, pem_password_cb *cb, void *u);
OPENSSL_EXPORT int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
                                  void *x, const EVP_CIPHER *enc,
                                  const unsigned char *pass, int pass_len,
                                  pem_password_cb *callback, void *u);

// PEM_def_callback treats `userdata` as a string and copies it into `buf`,
// assuming its `size` is sufficient. Returns the length of the string, or -1 on
// error. Error cases the buffer being too small, or `buf` and `userdata` being
// NULL. Note that this is different from OpenSSL, which prompts for a password.
OPENSSL_EXPORT int PEM_def_callback(char *buf, int size, int rwflag,
                                    void *userdata);


DECLARE_PEM_rw(X509, X509)

// TODO(crbug.com/boringssl/426): When documenting these, copy the warning
// about auxiliary properties from `PEM_X509_INFO_read_bio`.

DECLARE_PEM_rw(X509_AUX, X509)

DECLARE_PEM_rw(X509_REQ, X509_REQ)
DECLARE_PEM_write(X509_REQ_NEW, X509_REQ)

DECLARE_PEM_rw(X509_CRL, X509_CRL)

DECLARE_PEM_rw(PKCS7, PKCS7)
DECLARE_PEM_rw(PKCS8, X509_SIG)

DECLARE_PEM_rw(PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO)

DECLARE_PEM_rw_cb(RSAPrivateKey, RSA)

DECLARE_PEM_rw_const(RSAPublicKey, RSA)
DECLARE_PEM_rw(RSA_PUBKEY, RSA)

#ifndef OPENSSL_NO_DSA

DECLARE_PEM_rw_cb(DSAPrivateKey, DSA)

DECLARE_PEM_rw(DSA_PUBKEY, DSA)

DECLARE_PEM_rw_const(DSAparams, DSA)

#endif

DECLARE_PEM_rw_cb(ECPrivateKey, EC_KEY)
DECLARE_PEM_rw(EC_PUBKEY, EC_KEY)


DECLARE_PEM_rw_const(DHparams, DH)


DECLARE_PEM_rw_cb(PrivateKey, EVP_PKEY)

DECLARE_PEM_rw(PUBKEY, EVP_PKEY)

OPENSSL_EXPORT int PEM_write_bio_PKCS8PrivateKey_nid(BIO *bp, const EVP_PKEY *x,
                                                     int nid, const char *pass,
                                                     int pass_len,
                                                     pem_password_cb *cb,
                                                     void *u);
OPENSSL_EXPORT int PEM_write_bio_PKCS8PrivateKey(BIO *bp, const EVP_PKEY *x,
                                                 const EVP_CIPHER *enc,
                                                 const char *pass, int pass_len,
                                                 pem_password_cb *cb, void *u);
OPENSSL_EXPORT int i2d_PKCS8PrivateKey_bio(BIO *bp, const EVP_PKEY *x,
                                           const EVP_CIPHER *enc,
                                           const char *pass, int pass_len,
                                           pem_password_cb *cb, void *u);
OPENSSL_EXPORT int i2d_PKCS8PrivateKey_nid_bio(BIO *bp, const EVP_PKEY *x,
                                               int nid, const char *pass,
                                               int pass_len,
                                               pem_password_cb *cb, void *u);
OPENSSL_EXPORT EVP_PKEY *d2i_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY **x,
                                                 pem_password_cb *cb, void *u);

OPENSSL_EXPORT int i2d_PKCS8PrivateKey_fp(FILE *fp, const EVP_PKEY *x,
                                          const EVP_CIPHER *enc,
                                          const char *pass, int pass_len,
                                          pem_password_cb *cb, void *u);
OPENSSL_EXPORT int i2d_PKCS8PrivateKey_nid_fp(FILE *fp, const EVP_PKEY *x,
                                              int nid, const char *pass,
                                              int pass_len, pem_password_cb *cb,
                                              void *u);
OPENSSL_EXPORT int PEM_write_PKCS8PrivateKey_nid(FILE *fp, const EVP_PKEY *x,
                                                 int nid, const char *pass,
                                                 int pass_len,
                                                 pem_password_cb *cb, void *u);

OPENSSL_EXPORT EVP_PKEY *d2i_PKCS8PrivateKey_fp(FILE *fp, EVP_PKEY **x,
                                                pem_password_cb *cb, void *u);

OPENSSL_EXPORT int PEM_write_PKCS8PrivateKey(FILE *fp, const EVP_PKEY *x,
                                             const EVP_CIPHER *enc,
                                             const char *pass, int pass_len,
                                             pem_password_cb *cd, void *u);


#if defined(__cplusplus)
}  // extern C
#endif

#define PEM_R_BAD_BASE64_DECODE 100
#define PEM_R_BAD_DECRYPT 101
#define PEM_R_BAD_END_LINE 102
#define PEM_R_BAD_IV_CHARS 103
#define PEM_R_BAD_PASSWORD_READ 104
#define PEM_R_CIPHER_IS_NULL 105
#define PEM_R_ERROR_CONVERTING_PRIVATE_KEY 106
#define PEM_R_NOT_DEK_INFO 107
#define PEM_R_NOT_ENCRYPTED 108
#define PEM_R_NOT_PROC_TYPE 109
#define PEM_R_NO_START_LINE 110
#define PEM_R_READ_KEY 111
#define PEM_R_SHORT_HEADER 112
#define PEM_R_UNSUPPORTED_CIPHER 113
#define PEM_R_UNSUPPORTED_ENCRYPTION 114
#define PEM_R_UNSUPPORTED_PROC_TYPE_VERSION 115
#define PEM_R_NO_DATA 116

#endif  // OPENSSL_HEADER_PEM_H

Coverage Report

Created: 2026-06-15 07:04